I've an issue with Ole D&D.
I've a TEmbeddedObjContainer that act as container panel for all my controls I want to embed in the editor, at the top of that container there is a TOleDragPanel that hancled D&D.. TOleDragPanel is a simple TPanel descendant that overrides some method to automatically handle D&D (code below).
What happens is that once ownerForm.rv.BeginOleDrag is get called once (it is in the MouseMove method) , there's a chance that D&D starts automatically without entering in the MouseMove event. This is true expecially when moving mouse at the very lower-right part of the object border when it is selected.
Is there a way to prevent D&D start without explicit fn call ?
Code: Select all
TOleDragPanel = class(TPanel)
protected
function selectCtrl(): TControl;
function ownerForm(): TStoryEditorForm;
procedure MouseDown(Button: TMouseButton; Shift: TShiftState; X, Y: Integer); override;
procedure MouseMove(Shift: TShiftState; X, Y: Integer); override;
procedure DblClick; override;
end;
{ TOleDragPanel }
procedure TOleDragPanel.DblClick;
begin
inherited;
TEmbeddedObjContainer(Self.Parent.Parent).ShowDialogClick(self);
end;
procedure TOleDragPanel.MouseDown(Button: TMouseButton; Shift: TShiftState; X, Y: Integer);
begin
inherited;
//writeln('TOleDragPanel(',IntToHex(integer(pointer(self)),8),').MouseDown()');
if Button = mbLeft then begin
ownerForm.rv.SelectControl(selectCtrl);
ownerForm.oleDrag.ObjEditor := Self.ObjEditor;
ownerForm.oleDrag.CollapsedSize := TEmbeddedObjContainer(selectCtrl).CollapsedSize;
ownerForm.oleDrag.ExpandedSize := TEmbeddedObjContainer(selectCtrl).ExpandedSize;
ownerForm.oleDrag.NowCollapsed := TEmbeddedObjContainer(selectCtrl).Collapsed;
ownerForm.oleDrag.mouseDownCtrl := Self;
ownerForm.oleDrag.mouseDownPoint := Point(X, Y);
end;
end;
procedure TOleDragPanel.MouseMove(Shift: TShiftState; X, Y: Integer);
begin
inherited;
//writeln('TOleDragPanel(',IntToHex(integer(pointer(self)),8),').MouseMove()');
if (ssLeft in Shift) and (ownerForm.oleDrag.mouseDownCtrl = Self) and
(Sqr(ownerForm.oleDrag.mouseDownPoint.X-X)+Sqr(ownerForm.oleDrag.mouseDownPoint.Y-Y)>10) then begin
ownerForm.rv.BeginOleDrag;
end;
end;
function TOleDragPanel.ownerForm: TStoryEditorForm;
begin
result := TEmbeddedObjContainer(Self.Parent.Parent).OwnerForm;
end;
function TOleDragPanel.selectCtrl: TControl;
begin
result := TControl(Self.Parent.Parent);
end;
function TOleDragPanel.ObjEditor: INewsObjEditor;
begin
result := TEmbeddedObjContainer(Self.Parent.Parent).ObjEditor;
end;